Starting circuit for single-phase induction motor

a single-phase induction motor and starting circuit technology, applied in the direction of dynamo-electric converter control, dynamo-electric gear control, electric generator control, etc., can solve the problems of difficult control of the starting circuit of the single-phase induction motor, resistance is already too high for the motor to operate normally, and the triac control positive characteristic thermistor takes a relatively long time to achieve the positive characteristic of the triac control, so as to reduce the variation of the cut o
US20060017418A1Active Publication Date: 2006-01-26MURATA MFG CO LTD
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
MURATA MFG CO LTD
Publication Date
2006-01-26

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Abstract

A starting circuit for a single-phase induction motor includes a motor starting positive characteristic thermistor and a triac arranged in a series connection, and a triac control positive characteristic thermistor connected in parallel with the motor starting positive characteristic thermistor, and including one terminal thereof connected to a gate of the triac. The triac control positive characteristic thermistor has a volume in the range of about 4.5 mm3 to about 30 mm3. The relationship of (√2×V×sin 45°) / R≧I is maintained with the triac control positive characteristic thermistor within an operating temperature range, where V represents a root-mean-square value of a power source voltage, R represents a resistance of the triac control positive characteristic thermistor, and I represents a gate turn-on current of the triac. The gate turn-on current I at an operating temperature of about 25° C. is about 20 mA or less.
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Description

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention relates to a starting circuit of a single-phase induction motor.

[0003] 2. Description of the Related Art

[0004] A known starting circuit of a single-phase induction motor used in a compressor of an electric refrigerator includes a motor starting positive characteristic thermistor and a triac connected in a serial connection which is in turn connected in series with an auxiliary coil for starting the motor. A triac control positive characteristic thermistor is connected in parallel with the motor starting positive characteristic thermistor. One terminal of the triac control positive characteristic thermistor is connected to a gate terminal of the triac.

[0005] In the starting circuit of the single-phase induction motor, a trigger signal, applied to the gate terminal of the triac through the triac control positive characteristic thermistor, causes the triac to be conductive. A motor starting cur...

Claims

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